Submitted on: 21 March 1998.
Revised on: 02 May 1998.
Accepted on: 11 June 1998.
___________________Chemical Industry & Chemical Engineering Quarterly
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Submitted on: 01 April 2006.
Revised on: 12 May 2006.
Accepted on: 07 June 2006.
___________________Chemical Industry & Chemical Engineering Quarterly
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Submitted on: 23 March 2003.
Revised on: 13 July 2003.
Accepted on: 28 August 2003.
___________________Chemical Industry & Chemical Engineering Quarterly
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Submitted on: 21 February 2012.
Revised on: 29 May 2012.
Accepted on: 07 July 2012.
___________________Chemical Industry & Chemical Engineering Quarterly